摘要
应用热丝化学气相沉积技术,将微米金刚石、纳米金刚石、微米—纳米金刚石多层、金刚石/β-SiC复合界面层+微米—纳米多层、(金刚石/β-SiC复合)/微米金刚石多层+纳米金刚石顶层、(金刚石/β-SiC复合)/纳米金刚石多层等6种金刚石结构涂层分别沉积在二刃硬质合金立铣刀上。在五轴数控加工中心对上述不同结构金刚石涂层刀具进行切削试验,切削对象为7075航空铝合金工件,选择未涂层的硬质合金刀具作为对照,以评估其加工性能。利用光学显微镜观察刀具磨损状态随切削时间变化的情况,并测量刀具的磨损量,对比沉积不同结构金刚石涂层和未涂层刀具在切削5 min,10 min,30 min,45 min,65 min和90 min后的光学显微形貌,得出后刀面磨损量随切削时间增加的变化曲线。采用激光共聚焦显微镜测试刀具切削后对应工件表面的粗糙度。结果表明:(金刚石/β-SiC复合)/微米金刚石多层结构涂层+纳米金刚石顶层的涂层刀具磨损程度最低,为36.67μm,在切削全程均表现出极佳的切削性能,切削后的工件具有最低的表面粗糙度,Ra值为5.77μm,服役性能表现最佳。(金刚石/β-SiC复合)/微米金刚石多层结构涂层+纳米金刚石顶层的涂层结构可以有效解决硬质合金与金刚石涂层结合强度和涂层在服役过程中过早失效的问题。
This paper employs Hot Filament Chemical Vapor Deposition technology to deposit six distinct diamond structures onto double-edged cemented carbide end mills:micron-diamond,nanodiamond,micron-nanodiamond multilayer,diamond/β-SiC composite interface layer+micron-nanodiamond multilayer,(diamond/β-SiC composite)/microndiamond multilayer+nanodiamond top layer,and(diamond/β-SiC composite)/nanodiamond multilayer.Cutting tests are conducted on these diamond-coated tools using a five-axis CNC machining center,with 7075 aerospace aluminum alloy as the workpiece,an uncoated carbide tool served as the control.The machining performance of these diamond-coated tools with distinct structural characteristics is evaluated.An optical microscope is employed to observe tool wear progression over cutting time,and wear measurements are taken.Comparisons are made between tools coated with different diamond structures and uncoated tools after 5 min,10 min,30 min,45 min,65 min,and 90 min.The laser confocal microscope is used to measure the surface roughness of the corresponding workpiece after cutting.Results indicate that the tool coated with a(diamond/β-SiC composite)/micron diamond multilayer structure coating+nanodiamond top layer exhibits the lowest wear rate of 36.67μm.It demonstrates excellent cutting performance throughout the entire cutting process,producing workpieces with the lowest surface roughness(Ra value of 5.77μm)and the best service performance.The coating structure of(diamond/β-SiC composite)/micron diamond multilayer structure+nanodiamond top layer effectively addresses the issues of bonding strength between cemented carbide and diamond coatings,as well as premature failure of the coating during service.
作者
刘鲁生
袁子尧
黄楠
宋昊哲
杨兵
姜辛
Liu Lusheng;Yuan Ziyao;Huang Nan;Song Haozhe;Yang Bing;Jiang Xin
出处
《工具技术》
2025年第12期42-51,共10页
Tool Engineering
基金
中国科学院仪器设备功能开发技术创新项目(sjzx-gnkf-202203)
沈阳材料科学国家研究中心仪器设备研制项目(L2022E06)。
关键词
金刚石涂层
复合多层涂层
切削性能
diamond coating
composite multilayer
cutting performance
